.middle .middle_center {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    margin-top: 20px;
    border-bottom: 1px solid black;
}

.middle .middle_center .middle_center_left {
    width: 600px;
    height: 600px;
    border: 1px solid black;
}

.middle .middle_center .middle_center_right {
    width: 400px;
    height: 600px;
    border: 1px solid black;
}

.middle .middle_center .middle_center_left .middle_center_left_nav,
.middle .middle_center .middle_center_right .middle_center_right_nav {
    height: 50px;
    border: 1px solid black;
}

.middle .middle_center .middle_center_left .middle_center_left_nav ul,
.middle .middle_center .middle_center_right .middle_center_right_nav ul {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}

.middle .middle_center .middle_center_left .middle_center_left_nav ul li,
.middle .middle_center .middle_center_right .middle_center_right_nav ul li {
    height: 50px;
    width: 100px;
    border: 1px solid black;
}

.middle .middle_center .middle_center_left .middle_center_left_up {
    height: 200px;
    border: 1px solid black;
    margin-top: 10px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}

.middle .middle_center .middle_center_left .middle_center_left_up .middle_center_left_up_icon {
    width: 200px;
    border: 1px solid black;
    height: 200px;
}

.middle .middle_center .middle_center_left .middle_center_left_up .middle_center_left_up_text {
    width: 400px;
    border: 1px solid black;
    line-height: 200px;
    text-align: center;
}

.middle .middle_center .middle_center_left .middle_center_left_center {
    width: 600px;
    height: 200px;
    border: 1px solid black;
    margin-top: 10px;
}

.middle .middle_center .middle_center_left .middle_center_left_down {
    width: 600px;
    height: 100px;
    border: 1px solid black;
    margin-top: 10px;
}

.middle .middle_center .middle_center_right .middle_center_right_imgs {
    width: 400px;
    height: 405px;
    border: 1px solid black;
    margin-top: 10px;
}

.middle .middle_center .middle_center_right .middle_center_right_title {
    width: 400px;
    height: 100px;
    border: 1px solid black;
    margin-top: 20px;
}